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Fix a few regular expression for pdf string.
My project https://github.com/tjwei/translatePDF uses pdfrw and handling a lot of unicode pdf string.
This is a patch that works for handling various Chinese string in pdf.
This patch fixed the following issue:
(\0160) should be parsed as \016 0 not oct(0160), so it should be decoded into \xe30 not max(int(1600, 8), 127).